iPhone 6 magnetic holder / stand for fridge, etc

I have an amp on top of my garage refrigerator and I hook my iPhone to it through the headphone jack. I made this so my phone would be securely held on the side of the fridge and I would be able to see and use the screen and buttons.

Print this standing upright, no supports needed. Glue a thin neodymium magnet to each corner on the back side. Now you can use it on any steel surface.

EDIT: I added the sketchup source files -- The "rounded" one is the final version after using a corner r